Discussion
Consider the following statements about the momentum integral equation:
1. It is derived by integrating the boundary-layer equations across the layer.
2. It requires an assumed velocity profile before it can be solved.
3. It applies only to laminar boundary layers.
Which of the statements given above is or are correct?
Answer: C
The first two are correct and describe both the derivation and the closure problem it leaves. The third is false: the integral form holds for turbulent layers too, and turbulent methods use it with an empirical skin-friction law in place of the laminar one.
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